How To Fix UPWB191 - Class &1 is not a subclass of CL_UPWB_BSP_APPL

SAP Error Message - Details

• Message type: E = Error

• Message class: UPWB - Messages for Development Class UPWB

• Message number: 191

• Message text: Class &1 is not a subclass of CL_UPWB_BSP_APPL

What causes this issue?

It is specified that the ABAP application class is not to be generated.
In this case the specified class has to be a subclass of standard class
<AB>CL_UPWB_BSP_APPL</>. The specified class <AB>&V1&</> is not a
subclass or is not active.

System Response

If the BSP application is generated in the Web Interface Builder,
generation may fail. If generation is successful and you start the
Web application, an error may occur if the BSP page does not correspond
to the data that delivers the class.

How to fix this error?

Use the standard class or a subclass of standard class <AB>CL_UPWB_BSP_
APPL</>, or set the "Generate class" setting to <SE><AB>true</></>.
If the specified class has been generated by the Web Interface Builder
before, also set the "Generate class" setting to <AB>true</>. Then you
will be asked explicitely before each generation whether your class
should be overwritten.
You will find more information in the F1 documentation on the "Generate
class" setting.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UPWB191 - Class &1 is not a subclass of CL_UPWB_BSP_APPL ?

  The SAP error message UPWB191 indicates that there is an issue with a class not being recognized as a subclass of CL_UPWB_BSP_APPL. This typically occurs in the context of SAP Business Planning and Consolidation (BPC) or when working with Web Application Designer (WAD) applications.
  Cause:
  
  Class Definition Issue: The class specified in the error message (denoted as &1) is either not defined correctly or does not extend the required superclass CL_UPWB_BSP_APPL.
  Incorrect Configuration: The application or component configuration may be pointing to a class that is not properly set up or does not inherit from the expected base class.
  Transport Issues: If the class was recently transported from another system, it may not have been transported correctly, leading to inconsistencies.
  Development Errors: If custom development has been done, there may be errors in the implementation of the class.
  
  Solution:
  
  
  Check Class Definition:
  
  Go to the ABAP Workbench (transaction SE80 or SE24) and check the class definition of the class mentioned in the error message.
  Ensure that it is defined as a subclass of CL_UPWB_BSP_APPL. You can do this by checking the inheritance in the class definition.
  
  
  
  Correct Inheritance:
  
  If the class does not inherit from CL_UPWB_BSP_APPL, modify the class definition to extend from this superclass.
  If you are not the developer, contact the developer responsible for the class to make the necessary changes.
  
  
  
  Review Configuration:
  
  Check the configuration settings in the application or component that is generating the error. Ensure that the correct class is being referenced.
  
  
  
  Transport Check:
  
  If the class was recently transported, verify that all necessary objects were included in the transport request and that they were imported correctly into the target system.
  
  
  
  Debugging:
  
  If the issue persists, consider debugging the application to trace where the error is being triggered. This may provide additional context on why the class is not recognized.
  
  
  
  SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional guidance.
  
  
  
  Related Information:
  
  Class Hierarchy: Understanding the class hierarchy in SAP ABAP can help in troubleshooting issues related to class inheritance.
  SAP BPC Documentation: Review the official SAP documentation for Business Planning and Consolidation for any specific guidelines related to class usage.
  Community Forums: Consider searching or posting on SAP community forums or sites like SAP Community or Stack Overflow for additional insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify and resolve the issue related to the UPWB191 error message.